Technology support for energy efficiency retrofit of existing residential buildings in heating areas in North China

According to the status of building energy efficiency, elaborates the importance of energy efficient retrofit for existing residential buildings in north heating areas. Compares and analyses some recent examples at home and abroad, and discusses some technical problems for energy efficiency retrofit of existing residential buildings. Analyses the basic requirements of technical route on each link of the energy efficiency retrofit, presents the methods of appraisement and diagnosis, and concretely analyses the technical schemes.